Piston packing-ring.



Patented Oct. 8, |90I.

No. 684,32l.

w. w. sT'. amm. PISTON PACKING RING.

(Application led Oct. 25, 1900.)

(No Model.)

UNITED STATES PATENT OFFICE.

VILLIAM lV. ST. JOHN, OF BINGIIAMTON, NEW YORK.

PlsToN PACKING-eme.

SPECIFICATION forming part of Letters Patent No. 684,321, dated oetobet's, 190i. ppumion mea October 25,' 1990,Y seal No. 34,348: (No mais Toall whom t may concern:

Be it known that I, WILLIAM W. Sr. JOHN, a citizen of the United States,residing at Binghamton, in the county of Broome and State of New York,have invented certain new and useful Improvements in PistonPacking-Rings; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to the letters of referencemarked thereon, which form a part of this specification.

My invention relates to that class of packing-rings for pistons in whichthe split ring is made steam-tight by a filling-piece of peculiarconstruction and arrangement.

The object of the invention is to produce a packing-ring of suchcross-section that one of the sections ts into a rabbet in the other andprovided with a filling-piece to form a tight joint; also, to producethe filling-piece with a tongue on its inner side, which fits into acorresponding rabbet in the ring; also, to arrange the filling-piece sothat it closes the joint of the ring in a thorough manner; also, that itcan be milled in while the ring is in the lathe and when put in can beturned off with the ring; furthermore, that the recess in the outsideface of the ring admits steam all around it, and small holes in thispart of the ring admit steam under the ring to press it against the boreof the cylinder, and, finally, that a perfectly-tight ring can beproduced at a small cost. The recessed part may be of any width toll thegroove, as it does not affect the packing-ringsurface.

With these objects in view my invention consists in the peculiarconstruction of certain parts and the novel arrangement of parts, aswill be more fully described hereinafter and specifically pointed out inthe claims, reference being had tothe accompanying drawings, in which-Figure l represents a plan of the packingring. Fig. 2 is a side or edgeview of the same, showing the filling-piece. Fig. 3 is a similar viewshowing the holes for admitting steam under the ring. Fig. 4 is across-seetion of a piston with the packing-rings in position.

In the drawings, A represents a packingring of the cross-section sliownin Fig'. 4, into which the auxiliary ring B, of I; shape, fits, havingone side fitting into a rabbet to retain it in position. These rings arecut and secured together by the rivets a, a, (shown'in Fig. 3,) whilethe opposite side is provided with the lling-piece O. In this view holesb b are shown for admitting steam under the ring A to press it outagainst the bore of the cylinder. The filling-piece C is provided with atongue c on its inner side, that iits into a rabbet, and it is held inplace by a rivet or pin d at one end, while the other end is free, so asto allow the ringto expand, as required. The tongue extends laterallyinto a rabbet arranged between the two faces of the ring C, and not asit has been heretofore donet'. e., extending sidewise from t-he ends ofthe lling-piece and into rabbets in a circumferential manner. In mypiston packing-ring the tongueis also arranged to extend laterallyaround the inner edge of the iilling-piece and is milled out of thethickness of the fillingpiece, while in all others known to me the saidfilling-piece is parallel and the tongue extends longitudinally from theends thereof. The recess for the filling-piece in the face of the ringadmits steam all around the ring and can be made of any Width desiredfor packing purposes. Au opening or hole e through the follower D oroutside of the groove serves to admit steam under the ring, if desired.A short spring may be used to hold the ends` of the ring down.

It will be readily observed by those skilled in the art that this ringwill make a perfectlytight packing for a piston, it is not liable to getout of order, it will not cause binding of the piston in the cylinder,can accommodate itself to the bore of the cylinder and yet form atightjoint,preventing any leakage of steam, which is a veryobjectionable feature in piston-packing and causing loss of horse-power;it can be readily produced at a reasonable cost, and it can be easilyapplied to steam, hydraulic, hot-air, pneumatic, or other engines.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

1. In a piston-packing, the combination of IOO the piston with thedivided packing-ring and a filling-piece having a ange projectingtherefrom and a rahbet in the packing-ring,

into which the ange of the filling-piece is 5 seated, substantially asspeeied.

2. In a. piston-packing, the combination of thepiston, and the dividedpacking-ring, with a filling-piece, having a ange projecing Icherefroxnand a rabbet in the pack- Io ing-ring, into which the said ange of thelling-pieee iS seated, spring and means for fastening the filling-pieceto the packing, 3.11V

as set forth. u In testimony whereof l affix my signature in presence ofc wowibnesses. l v

WILLIAM W. ST. JoIIN.

Vitnesses:

WALTER S. FLINT, ALBERT S. BARNES.

